Weft threading device for the shuttles of automatic and other looms



" ,8- 18, 1931- F. H. MEZERAY WEFT Tmmmme DEVICE ma THE snum'ngs OF Auwon'nc ANb 0mm? Locus Filed NOV. 1, 1928 a a m a E r I m M M n g T w A w .U y I w 5 F Patented Aug. 18, 1931 UNITED STATES FRANQOIS HENRI MEZERAY, .OF PERPIGNAN, FRANCE' WEFT THREADING DEVICE FOR THE SHUTTLES AUTOMATIC AND OTHER LOOMS Application filed November 1, 1928, Seria1 No. 316,387, and. in France November 5, 1927. r

The present invention relates to a weft threading device currently called a snail which can easily be adapted for use upon all types of shuttles for automatic or other weav- 5 ing looms.

The object of this invention is to provide a particularly practical form of this type of apparatus with a view not only to preventing any jamming of the thread in the grooves which it must traverse and follow, which may be caused by the knots which cannot be avoided, other irregularities and various other causes, but also of preventing any unthreading without ever it being possible for the device to be the direct cause of any break of the thread on account of the fact that the latter will always unwind normally Without any danger of coming out of its lodgment at the bottom of a groove or an accidental excessive tension being produced.

It is known that in the known apparatus employed up to the present time the weft thread frequently breaks for various reasons. The use for example of uneven threads as regards thickness and above all of linen and other tows, the knots formed during spinning I and in the preparation of the cops for weaving, are all causes presenting an obstacle to the passage of the thread in the guiding grooves and it is obvious that these thickenings and knots, by becoming ammed in the latter, cause inevitable breakages.

Further many forms of known apparatus include a beak for preventing the yarn from becoming unthreaded and it often happens that the yarn becomes wound round this beak causing an excessive tension of the latter which results in a break.

It is in order to remove these disadvantages 40 that the apparatus which is hereinafter described has been designed, which apparatus is arranged to make use of the helical unwinding, with a right hand pitch or a left hand pitch, of any yarn wound upon a support forming the weaving cops. The yarn in unwinding thus first enters a groove at the top of the apparatus, passes into an inclined groove in order to descend through a specially arranged passage into a hole at the bottom in order to be then threaded.

According to the direction in which the yarn unwinds the passage which corresponds to the entry of the yarn into the hole at the bottom is such that it Will form an obstacle preventing it from coming out once it has passed into the slot widening in height and depth which forms the passage which is formed along a generating line of the cylindrical part or hole at the base. V

This arrangement, while being capable of holding-the thread perfectly in place, thus prevents it from becoming unthreaded and also from becoming jammed.

As will be easily understood, this utilization of the helical unwinding of the thread necessitates the construction of different models as regards direction of travel, that is according as the apparatus is placed to the right or to the left'of the shuttle and the unwinding action takes place from right to left or left to right.

Figs. 1 to 7 accompanying the present description relate to a type of apparatus shown by way of example, the others being in general similar except for the direction of travel.

Fig. 1 is'a plan or top view of the apparatus. r a

Fig. 2 is a front View.

Fig. 3 is a right hand side view.

Fig. 4 is a left hand side view.

F ig..5 a view from below.

Fig. 6 a section taken along the line w, y Of Fig. 4; l 7

Fig.7 a-view of the back face.

Referring to these drawings it is seen that the apparatus is formed by members AB made of bronze or other suitable'metal in order to beset into the shuttle at the desired point. It is guided by a stud D and is pinned at E. A longitudinal groove '12 of U-shape is formed in the left hand part B and another groove a alsoof U-shape, but reversed and inclined relatively to b, is formed in the right hand part A so as to form a partition while leaving a passage 25 or groove along a generating line of the cylinder forming the hole T formed in the lower part V. 'This' passage widens in both directions of height and depth and allows the thread F to pass very easily and the latter passes out between the point 9 and the pin it, this space being situated in front of the eye of the shuttle.

The operation is as follows:

The thread coming from the cop first enters the groove 7) and from there, by following the inclined wall ofa, entersthrough the passage t into the hole T of the part or heel piece V. It here leaves the shuttle towards the left, passes in front of h and when it re- 7 turns towards the right it slides over 9, the space between 9 and h being in front of the eye of the shuttle.

The threading. is thus easy; it is sufficient to draw the thread backwards and then return it forward. 7 By examining Fig. 7 it is easy to see that as the thread unwinds in the direction from left to right it will be impossible for it to rise again in the passage 26 as theadvanced wall a masks or projects over this passage and opposes its unwinding in this direction. After this the thread thus remains perfectly in place and it can no longer either become jammed or unthreade'd.

In general, if the direction of the thread as it unwinds is from right to left, i. ecoun--- terclockwise looking. at Fig. 2,. the projecting wall. 0 should be at the left of the hole T, as shownin Fig. 2; while, if it unwinds from left to right (clockwise), the view shown in. Fig. 2 will be symmetrically reversed and the wall 0 will be located at the right of hole T. With. such an arrangement the thread, as it unwinds, tends to move downwardly as it passes the slot t and so is not urged upward into the slot. The relative position and symmetrical relationship of the parts A and B will, of course, depend upon whether the automatic change of bobbins takes place at the right or at the left of the loo1n,,and whether the thread unwinds in the clockwise or counterclockwise direction. In the form of the device illustrated, the bobbin change takes place at the left of the loom and the thread unwinds from right to left.

What claim is:

1. A threading device for shuttles comprising a block composed of two sections and having a slot located between said sections and leading to a thread-retaining hole located in one of said sections, and a projection lo"-- cate'd on the other section and formed by a thickening of said other section toward one end of the block, said slot extending toward the side of the hole at which the thread tends to move downwardly as it is unwound from the bobbin.

2. A device as set forth in claim 1, in which said slot includes two connected and reversely turned longitudinally extending Ubends.

In testimony whereof I have aflixed my signature.

FRANQOIS HENRI MEZERAY. 

